Usgs.gov USGS.gov | Science for a changing world
usgs.gov Desktop Performance
68/100
These metrics represent real-world Chrome users experience viewing usgs.gov web page. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
First Input Delay
First Contentful Paint
Cumulative Layout Shift
Largest Contentful Paint
Metrics
Largest Contentful Paint23/100 3.6 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint55/100 1.5 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Speed Index73/100 1.8 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive89/100 2.5 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Total Blocking Time100/100 40 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Should Fix (19)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Use video formats for animated content
Potential savings of 11,214 KiB
8,650 ms
Serve images in next-gen formats
Potential savings of 2,495 KiB
2,100 ms
Preload key requests
Potential savings of 1,030 ms
1,030 ms
Eliminate render-blocking resources
Potential savings of 1,000 ms
1,000 ms
Enable text compression
Potential savings of 234 KiB
720 ms
Remove unused JavaScript
Potential savings of 265 KiB
680 ms
Avoid multiple page redirects
Potential savings of 340 ms
340 ms
Minify JavaScript
Potential savings of 79 KiB
280 ms
Remove unused CSS
Potential savings of 90 KiB
240 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Avoid enormous network payloads
Total size was 14,745 KiB
Ensure text remains visible during webfont load
Serve static assets with an efficient cache policy
29 resources found
Does not use passive listeners to improve scrolling performance
Avoid an excessive DOM size
1,047 elements
Avoid large layout shifts
1 element found
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
46 requests • 14,745 KiB
Avoid chaining critical requests
9 chains found
Avoid long main-thread tasks
3 long tasks found
Passed Audits (10)
Initial server response time was short
Root document took 100 ms
Properly size images
Potential savings of 95 KiB
JavaScript execution time
0.4 s
Efficiently encode images
Potential savings of 62 KiB
Minimizes main-thread work
1.0 s
Defer offscreen images
Minimize third-party usage
Third-party code blocked the main thread for 0 ms
Preconnect to required origins
Minify CSS
Avoids `document.write()`
usgs.gov Desktop SEO
75/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Should Fix (3)
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Links do not have descriptive text
4 links found
Document does not have a meta description
Passed Audits (9)
Page isn’t blocked from indexing
Document has a valid `hreflang`
Document avoids plugins
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
robots.txt is valid
Image elements have `[alt]` attributes
Document has a valid `rel=canonical`
Document has a `<title>` element
Page has successful HTTP status code
usgs.gov Desktop Best Practices
62/100
These checks highlight opportunities to improve the overall code health of usgs.gov page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (5)
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Links to cross-origin destinations are unsafe
Does not use HTTPS
1 insecure request found
General
Browser errors were logged to the console
Browser Compatibility
Page lacks the HTML doctype, thus triggering quirks-mode
Passed Audits (9)
Avoids deprecated APIs
Properly defines charset
Displays images with correct aspect ratio
Avoids requesting the notification permission on page load
Detected JavaScript libraries
Avoids requesting the geolocation permission on page load
Serves images with appropriate resolution
Allows users to paste into password fields
Avoids Application Cache
usgs.gov Desktop Progressive Web App
26/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (8)
Installable
Does not register a service worker that controls page and `start_url`
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
PWA Optimized
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Fast and reliable
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 11.6 s
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Passed Audits (5)
Redirects HTTP traffic to HTTPS
Provides a valid `apple-touch-icon`
Contains some content when JavaScript is not available
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Sets a theme color for the address bar.
usgs.gov Desktop Accessibility
77/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (6)
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
`[aria-*]` attributes do not match their roles
`[aria-hidden="true"]` elements contain focusable descendents
`[aria-*]` attributes do not have valid values
Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children.
ARIA input fields do not have accessible names
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (20)
`[id]` attributes on active, focusable elements are unique
`[role]`s are contained by their required parent element
No element has a `[tabindex]` value greater than 0
Form elements have associated labels
Heading elements appear in a sequentially-descending order
`<html>` element has a valid value for its `[lang]` attribute
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Links have a discernible name
ARIA IDs are unique
`[aria-hidden="true"]` is not present on the document `<body>`
The page contains a heading, skip link, or landmark region
Buttons have an accessible name
Image elements have `[alt]` attributes
`[role]`s have all required `[aria-*]` attributes
`[role]` values are valid
`[aria-*]` attributes are valid and not misspelled
Document has a `<title>` element
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<html>` element has a `[lang]` attribute
Desktop Speed
71/100
These checks analyze the performance of usgs.gov on desktop devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (6)
Reduce server response time
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Optimize images
Prioritize visible content
Minify JavaScript
Passed Audits (4)
Avoid landing page redirects
Enable compression
Minify CSS
Minify HTML
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